EP 1412920 B1 20080227 - A GENERAL PURPOSE IMAGE ENHANCEMENT ALGORITHM WHICH AUGMENTS THE VISUAL PERCEPTION OF DETAIL IN DIGITAL IMAGES
Title (en)
A GENERAL PURPOSE IMAGE ENHANCEMENT ALGORITHM WHICH AUGMENTS THE VISUAL PERCEPTION OF DETAIL IN DIGITAL IMAGES
Title (de)
ALLZWECKBILDVERBESSERUNGSALGORITHMUS, DER DETAILS IN DIGITALBILDERN VISUELL BESSER ERKENNBAR MACHT
Title (fr)
ALGORITHME D'AMELIORATION D'IMAGES GENERAL AUGMENTANT LA PERCEPTION VISUELLE DES DETAILS DANS DES IMAGES NUMERIQUES
Publication
Application
Priority
- US 0223828 W 20020725
- US 91696801 A 20010727
Abstract (en)
[origin: US2003021488A1] A tone correction system, method and interface is described in which a digital image is initially filtered to obtain a corresponding locally averaged value for each pixel value of the image. The image is optimally filtered using a cone-type filter having a small filter radius and which favorably weights the center pixel values of the radius. Shadow and highlight values are obtained from selected shadow and highlight functions, respectively, using the locally averaged values. A tone function is derived from each of the shadow an highlight values for each pixel. Each pixel value of the image is then remapped according to its derived shadow and highlight tone functions. The tone corrected image can be reinteratively corrected by adjusting parameters of the shadow and highlight functions and remapping the image data until a desired image quality is achieved.
IPC 8 full level
B41J 2/52 (2006.01); G06T 5/40 (2006.01); G06T 5/00 (2006.01); G06T 5/20 (2006.01); H04N 1/407 (2006.01); H04N 1/409 (2006.01)
CPC (source: EP US)
G06T 5/20 (2013.01 - EP US); G06T 5/94 (2024.01 - EP US); G06T 2200/24 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 2003021488 A1 20030130; US 6792160 B2 20040914; AU 2002322693 A1 20030217; DE 60225296 D1 20080410; DE 60225296 T2 20090219; EP 1412920 A2 20040428; EP 1412920 B1 20080227; JP 2005526300 A 20050902; JP 4085058 B2 20080430; WO 03013149 A2 20030213; WO 03013149 A3 20040122
DOCDB simple family (application)
US 91696801 A 20010727; AU 2002322693 A 20020725; DE 60225296 T 20020725; EP 02756703 A 20020725; JP 2003518191 A 20020725; US 0223828 W 20020725